Okay So I Was On Viorele But Didn't Like It

Okay so I was on viorele but didn't like it so I stopped a week into the third month. I got my period a few days later for week two. Week three I had sex and the condom broke. We had unprotected sex three times but I took plan b that same night. I've never had side effects from plan b but yesterday I started feeling like vomiting and my back is hurting. The condom incident was Friday and today is Wednesday. Is it just plan b messing with my cycle or should I be taking a pregnancy test